Fundamental properties of stars from Kepler and Gaia data: parallax offset and revised scaling relations (original) (raw)

2021, Monthly Notices of the Royal Astronomical Society

Data from the space missions Gaia, Kepler, CoRoT and TESS, make it possible to compare parallax and asteroseismic distances. From the ratio of two densities ρsca/ρπ, we obtain an empirical relation fΔν between the asteroseismic large frequency separation and mean density, which is important for more accurate stellar mass and radius. This expression for main-sequence (MS) and subgiant stars with K-band magnitude is very close to the one obtained from interior MS models by Yıldız, Çelik & Kayhan. We also discuss the effects of effective temperature and parallax offset as the source of the difference between asteroseismic and non-asteroseismic stellar parameters. We have obtained our best results for about 3500 red giants (RGs) by using 2MASS data and model values for fΔν from Sharma et al. Another unknown scaling parameter fnurmmaxf_{\nu _{\rm max}}fnurmmax comes from the relationship between the frequency of maximum amplitude and gravity. Using different combinations of fnurmmaxf_{\nu _{\rm max}}fnurmmax and th...

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